What could be causing the issue of not being able to concatenate the variable $name with 'upload/' in the PHP code snippet provided?

The issue of not being able to concatenate the variable $name with 'upload/' in the PHP code snippet could be due to the variable $name not being properly defined or initialized before the concatenation operation. To solve this issue, make sure that the $name variable is defined and has a value assigned to it before trying to concatenate it with 'upload/'.

// Define and initialize the $name variable before concatenating it with 'upload/'
$name = "example.jpg";
$target_file = 'upload/' . $name;

// Use the $target_file variable in your code as needed
echo $target_file;